buer | 7203a338d66ac5456e265ed210c09b7c28ec6bd50d46d48c8d38fe14846f834f

General

Target

7.exe
Size

547KB
MD5

91fa6215582b42f5cca599ba02bb737e
SHA1

77ea850c55d4d6dc51e1e25235a27d5f90d733e6
SHA256

7203a338d66ac5456e265ed210c09b7c28ec6bd50d46d48c8d38fe14846f834f
SHA512

e3e9bce29241fac8e9920acc39b4aec8b1dc70b1b954d634ee4776dc336c31657591a1d8bc735d5a827622ec3020172c0c54327ad150ba89baf85a5b9b656738

Score

10^/10

buer loader persistence

Malware Config

Extracted

Family

buer

C2

http://lodddd01.info/

http://lodddd02.info/

Signatures

Buer
Buer is a new modular loader first seen in August 2019.
loader buer

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\ProgramData\\UBlockPlugin\\plugin.exe\""	plugin.exe

Suspicious use of NtCreateProcessExOtherParentProcess 2 IoCs

description	pid	Process	procid_target
PID 3296 created 3292	3296	WerFault.exe	61
PID 3812 created 1576	3812	WerFault.exe	60

Buer Loader 2 IoCs

Detects Buer loader in memory or disk.

resource	yara_rule
behavioral2/files/0x000300000001ed13-131.dat	buer
behavioral2/files/0x000300000001ed13-132.dat	buer

Executes dropped EXE 1 IoCs

pid	Process
1576	plugin.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\AppCompat\Programs\Amcache.hve.tmp	WerFault.exe

Program crash 2 IoCs

pid	pid_target	Process	procid_target
240	3292	WerFault.exe	61
2268	1576	WerFault.exe	60

Checks processor information in registry 2 TTPs 6 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WerFault.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\CentralProcessor\0	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\~MHz	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	WerFault.exe

Enumerates system info in registry 2 TTPs 4 IoCs

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WerFault.exe
Key opened	\REGISTRY\MACHINE\Hardware\Description\System\BIOS	WerFault.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\BIOS\SystemSKU	WerFault.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1576	plugin.exe
1576	plugin.exe
2268	WerFault.exe
2268	WerFault.exe
240	WerFault.exe
240	WerFault.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeRestorePrivilege	240	WerFault.exe
Token: SeBackupPrivilege	240	WerFault.exe
Token: SeRestorePrivilege	2268	WerFault.exe
Token: SeBackupPrivilege	2268	WerFault.exe
Token: SeBackupPrivilege	2268	WerFault.exe

Suspicious use of WriteProcessMemory 18 IoCs

description	pid	Process	procid_target
PID 3516 wrote to memory of 1576	3516	7.exe	60
PID 3516 wrote to memory of 1576	3516	7.exe	60
PID 3516 wrote to memory of 1576	3516	7.exe	60
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 1576 wrote to memory of 3292	1576	plugin.exe	61
PID 3296 wrote to memory of 3292	3296	WerFault.exe	61
PID 3296 wrote to memory of 3292	3296	WerFault.exe	61
PID 3812 wrote to memory of 1576	3812	WerFault.exe	60
PID 3812 wrote to memory of 1576	3812	WerFault.exe	60

C:\Users\Admin\AppData\Local\Temp\7.exe
"C:\Users\Admin\AppData\Local\Temp\7.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3516
- C:\ProgramData\UBlockPlugin\plugin.exe
  C:\ProgramData\UBlockPlugin\plugin.exe "C:\Users\Admin\AppData\Local\Temp\7.exe" ensgJJ
  2⤵
  - Modifies WinLogon for persistence
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1576
- - C:\Windows\SysWOW64\secinit.exe
    C:\ProgramData\UBlockPlugin\plugin.exe
    3⤵
    PID:3292
  - - C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 3292 -s 220
      4⤵
      Program crash
      Checks processor information in registry
      Enumerates system info in registry
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:240
- - C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -u -p 1576 -s 948
    3⤵
    - Drops file in Windows directory
    - Program crash
    - Checks processor information in registry
    - Enumerates system info in registry
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:2268

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 3292 -ip 3292
1⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Suspicious use of WriteProcessMemory
PID:3296

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1576 -ip 1576
1⤵
- Suspicious use of NtCreateProcessExOtherParentProcess
- Suspicious use of WriteProcessMemory
PID:3812